Prepare next development version.

gradle.properties

@@ -33,7 +33,7 @@ org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8 \
   --add-exports jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED
 
 GROUP=dev.zacsweers.moshix
-VERSION_NAME=0.12.1
+VERSION_NAME=0.13.0-SNAPSHOT
 POM_DESCRIPTION=Moshi Extensions
 POM_URL=https://github.com/ZacSweers/MoshiX
 POM_SCM_URL=https://github.com/ZacSweers/MoshiX